I have a picture in the database of a United DC-8 interior I took in 1971. The 727s and 737s had a mix of very different colors and patterns all in the same aircraft. Some were yellow with a colorful plaid design on them. Some were either mustard color or dark blue with little squared circle designs. Some were solid colors, like red-orange. I have some pictures, but they have people in them, so I can't post them. Also, just before the current interior design, I was on a UA
737-200 with all orange seats.